1. Chemistry

    A sample of the compound prepared in this experiment, weighing .1021g, is dissolved in HNO3 and diluted to a volume of 100mL. A 10mL aliquot of that solution is mixed iwth 10mL 6 M NH3. The [Cu(NH3)4 2+] in the resulting solution is 5.16x10^-3 M. How many

    asked by Anonymous on October 17, 2011
  2. chemistry

    Not sure how to do any of this. Please help!!! A sample of the compound prepared in this experiment, weighing .1021g, is dissolved in HNO3 and diluted to a volume of 100mL. A 10mL aliquot of that solution is mixed iwth 10mL 6 M NH3. The [Cu(NH3)4 2+] in

    asked by Kyle on October 7, 2010
  3. Chemistry

    Ammonia (NH3) ionizes according to the following reaction: NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH–(aq) The base dissociation constant for ammonia (NH3) is Kb = 1.8 × 10–5. Ammonia (NH3) also has a chloride salt, ammonium chloride (NH4Cl), which is soluble

    asked by Summer on April 9, 2018
  4. anatomy and physiology

    this is for a musculoskeletal crossword puzzle and if you can help me with any of the answers i would be soo grateful. boat-like cavities _ _ _ _ _ _ _ builds up during oxygen deficiency _ _ _ _ _ _a_ _ _ unit of contraction _ _ _ _ _ _e_ _ insufficient

    asked by Lisa on December 7, 2008
  5. Chemistry Help Please

    Titration of a Sample of Household bleaches: The oxidizing agent in a household bleach is determined by placing 100 mL of distilled water in a 250 mL Erlenmeyer flask and adding 10 mL of the 10% (w/w) KI solution, swirling the contents of the flask to mix

    asked by Sara on October 22, 2008
  6. CHEM!

    Okay well I suddenly got confused for a lab I did We took pH meter than we calibrate it. Then we measure the pH of the acetic acid solution, which was used to determine the Ka of the acetic acid using the first method. We made a 1M solution of NaOH which

    asked by Linda on May 9, 2007
  7. Biology

    Match the following terms Gametes Codomiance Diploid Haploid Genotype Allele Heterozygous Recessive Trait Homozygous Incomplete Dominance Phenotype Dominant Multiple Allele Trait a. contains 1 copy of each chromosome b. a trait with more than 2 versions of

    asked by Jiskha Help on March 4, 2019
  8. chemistry

    An ideal solution of 5.00 mole benzene and 3.25 mole toluene. At 298 K, the vapor pressure of the pure benzene and toluene were 96. Torr, and 28.9 Torr, respectively. At what pressure does the vapor phase appear first, if the pressure above this solution

    asked by Anonymous on May 12, 2014
  9. algebra

    Can someone PLEASE explain how to do this to me? Thank you so much! Ten gallons of a 30% acid mixture is obtained by mixing a 50% solution (X) with 20% solution (Y). Write an equation for the 10 gallon mixture. What is the acid concentration, in gallons,

    asked by Holly on October 28, 2010
  10. Statistics

    Sickle cell anemia is a genetic blood disorder where red blood cells lose their flexibility and assume an abnormal, rigid, "sickle" shape, which results in a risk of various complications. If both parents are carriers of the disease, then a child has a

    asked by Neveah on February 5, 2016
  11. Philosophy

    can someone explain what this teacher wants me to do, do I put and x in the box or write something this all new to me. thank you HELP!!!! Socrates, Plato, and Aristotle Matrix Fill in the matrix below, denoting each philosopher’s view concerning the

    asked by kathy on May 27, 2007
  12. please help Chemistry

    Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of

    asked by george on March 26, 2015
  13. Chemistry

    Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of

    asked by Troy on March 24, 2015
  14. childcare

    Carlos is playing in the sandbox, Thomas approaches the sandbox, observes Carlos for a moment, then knocks over the bucket Carlos has just filled with sand. Carlos pushes Thomas away saying, "Get out of here". Thomas begins to cry 1 The goal of Thomas's

    asked by Rosa on November 19, 2009
  15. AP Bio potato/osmosis lab

    If a potato core is allowed to dehydrate by sitting in open air, would the water potential of the potato cells decrease or increase? i think it decreases but i'm not sure. and if a plant cell has a lower water potential than its surroundings and if

    asked by lisa on October 25, 2006
  16. chemistry

    I understand part (I) but We have only briefly gone over the HH equation in class and I understand how to use it to get the pH but I really don't understand how to use it in part (II), assuming I should be using it in this question? (I)Calculate the pH of

    asked by Tim on April 10, 2015
  17. chemistry

    As you saw in Part B, the vapor above the cyclohexane-acetone solution is composed of both cyclohexane vapor and acetone vapor. What mole fraction of the vapor above the solution, X(cy) vapor), is cyclohexane?

    asked by me on February 8, 2011
  18. Biology

    38. Mitosis and meiosis are the two different ways cells divide. They both share common characteristics and processes, but differ in some very important ways. I answered part A and B of this, but I need help with C: c. Why is it important for chromosomal

    asked by mysterychicken on February 13, 2010
  19. Biology

    *Yawn* Match the terms with the correct description: a. regulates supply of gases from ATP production b. provides negative feedback signals c. protects body against foreign dangers d. "rapid transit" for liquids and gases e. primary "regulator" of sensory

    asked by mysterychicken on March 21, 2010
  20. Chemistry

    In a crazy scenario, the Oylan Vinegar Company has 10,000 gallons of vinegar with 0.622% concentration. This vinegar solution cannot be sold because it's too weak, but the plant manager can't bear to discard it. OVC also has a large batch of vinegar that

    asked by Mads on March 13, 2016
  21. chemistry

    Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of

    asked by george on March 26, 2015
  22. French

    I have to write a pagraph in the passé composé explaining what happened yesterday or last week. I have to write at least 8 sentences in correct French. Can you check it and see if all my sentences are correct. Je suis allé à l'église hier. Après la

    asked by Keyanna on December 14, 2009
  23. English grammar check

    Choose the correct answer which corrects the following sentences without changing its meaning 1. I want to get a well-paying job. Which is why I am attending college. a. I want to get a well-paying job. Which is why I am attending college. b. I want to get

    asked by ME on October 13, 2011
  24. Chemistry

    A sample of 9.4 grams of NaOH is dissolved into 693 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 2.37 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the

    asked by May on October 11, 2010
  25. Science

    Are any of the bellow chemical changes reversible? If yes, then how? Mixture of Lear Nitrate and Potassium Iodide Mixture of Copper Sulphate Solution and Iron Mixture of Copper Sulphate Solution and Sodium Carbonate Mixture of Dilute Hydrochloric Acid and

    asked by Javal on October 24, 2010
  26. DrBobb222 : Chemistry HElp...Please Check

    Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately “weighing by difference” about 0.1 g of KIO3 and placing it in your 100 mL volumetric flask. Fill the flask to mark with distilled water.

    asked by Sara on October 21, 2008
  27. chemistry

    Which of the answer choices correctly describes an action that will increase the solubility of a solid solute in water? cool the solution increase the pressure heat the solution decrease the pressure Examine the statement. The energy required to break the

    asked by PLEASE help on September 22, 2017
  28. Algebra Multiple choice revised!! HELP

    I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give

    asked by Kris on March 28, 2013
  29. Chemistry

    You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 243.0 ppm and is initially uniform through the thickness of the

    asked by Desperate on December 15, 2012
  30. physics

    Suppose the coefficient of static friction between the road and the tires on a car is 0.749 and the car has no negative lift. What speed will put the car on the verge of sliding as it rounds a level curve of 31.7 m radius?

    asked by Anonymous on March 17, 2016
  31. Science

    An automobile accelerates 1.24 m/s^2 over 6.00 s to reach freeway speed at the end of an entrance ramp. If the cars final speed is 86.0 km/h, what was its initial speed when it began accelerating? Express your answer in km/h I can do it but I just don't

    asked by John on October 25, 2016
  32. biology

    Can someone explain to me how a plasma/cell membrane carry put the following functions? i've searched the net and can't seem to find anything on them * Compartmentalization of the cell into organelles * Organization of biochemical pathways –Attain

    asked by kimora on November 25, 2008
  33. chemistry

    Iron can be determined gravimetrically by precipitating as Fe(OH)3 and igniting to Fe2O3. The sample to be analyzed is weighed and transferred to a 400-mL beaker where it is dissolved in 50 mL of H2O and 10 mL of 6 M HCl. Any Fe2+ that is present is

    asked by Anonymous on March 29, 2017
  34. Chemistry

    Consider the following equilibrium: 2HI(g) *are in equilibrium with* H2(g) = I2(g) Keq = 81.0 A 2.00L container is initially filled with 4.00 mol HI. Calculate the [HI] at equilibrium. *I don't know how to put the equilibrium sign on the computer* Can

    asked by katie on November 12, 2014
  35. Chemistry

    If you have 20.0g of a Maalox tablet, and 40mL of .1 M HCI, how much extra help from NaOH would you need to bring the acid to neutral? Back titrate using .05 mL NaOH, drop by drop. Please put this into a formula for me to figure out. Thanks.

    asked by Pam on March 26, 2013
  36. CONTEMPORARY ISSUES IN AMERICAN EDUCATION

    Standards-based education can sometimes put pressure on teachers to be sure they measure up to state standards. How does teacher accountability have a positive influence on the classroom environment? How does it have a negative influence?

    asked by mike on December 14, 2007
  37. algebra

    Cut a piece of paper to form a triangle shape. Tear off the three corners of the triangle. Then put the three corners together. Describe what you see. What mathematical truth does this activity illustrate? Explain

    asked by lucy on February 10, 2012
  38. EnGlIsH

    hi there mm i have to put the meaning of thus sentence it about comparisons and contrast clues... Althought we had expected a multitud to come to the rally, only ten or fifteen people showed up. comparison/contrast Meaning:????

    asked by anonymous on September 22, 2010
  39. Math

    My math teacher gave us this problem. Put the numbers 8,6,2,5,10,1,3,7,9,4 in number order of 1 to 10 in 5 moves. You can move 1,2,or 3 numbers for each move. If you don't have time to solve, any tips would be great!

    asked by Amy on November 18, 2012
  40. Ms. sue can u help me

    tamara wants 2 put new ceramic tile on her kitchen countertop.The tiles she's going to use is in the shape of a square,measuring 4 inches on each side.The countertop is 6 feet long and 2 feet wide.

    asked by yuku on February 25, 2010
  41. algebra

    The total charge for a taxi ride includes an initial fee of $2.75 plus $2.25 for every 1/2 mile traveled. Joe took a taxi, and the ride cost him $56.75. How would this be put in a equation? Show your work.

    asked by syram on March 20, 2013
  42. English

    I have two more questions on the same theme. Thank you. 1)Pay attention to (not at) your teachers' explanations. 2)You must put up your hand, if you want to ask a question to your teacher/your teacher a question . Are they both possible? 3) You mustn's

    asked by Mike on April 3, 2011
  43. Math word problem

    A carpenter wants to put four shelves on an 8-foot wall so that the five spaces created decrease by 6 inches as we move up the wall. If the thickness of each shelf is 3/4 inch, how far will the bottom shelf be from the floor?

    asked by Megan on September 21, 2011
  44. 9th grade

    A student put 12.4 grams of potassium sulfate in 29 ml and stirred for 3 hrs. he saw that not all of the solid dissolved, so he removed the extra solid and found it had a mass of 3.4 grams. what was the solubility of the chemical?

    asked by Anonymous on February 21, 2010
  45. Physics

    What is the maximum charge that can be put on a conducting sphere of radius 15 cm if it is not to spark? That is, the electric field at its surface cannot exceed the dielectric strength of air. b) What is the sphere's voltage at this charge?

    asked by lindsey on February 27, 2013
  46. Biology

    Identify the Protist and explain why you think it is what you said. We took dead leaves from outside, put them in boiling water then looked at them a week later. Link to image below! LINK: postimg. org/image/gu1201se9

    asked by Jen on May 13, 2016
  47. Biology

    Identify the Protist and explain why you think it is what you said. We took dead leaves from outside, put them in boiling water then looked at them a week later. Link to image below! LINK: postimg. org/image/gu1201se9/

    asked by Jen on May 13, 2016
  48. Algebra-Reiny please explain this

    Hi Reiny, I posted this problem earlier and you responded but I don't get the reasoning- The problem was -2log8(x+1) = -8 you said multiply by -2 and then you put log8(x+1)=4(wasn't that dividing by -2) log8(x+1)^2 = 8 (how did you get to the power of 2

    asked by Anna on December 13, 2010
  49. nonfiction

    Thoreau writes that people should be "mining themselves for gold." By this he is stating, in another way, the ideal of Socrates, which was to A. know thyself. B. deny thyself to learn what is valuable. C. live and let live. D. put first things first

    asked by Linda on October 15, 2011
  50. spelling

    in alphabetical order which comes first brothers brother's? I don't know, but I added new folders with those titles to my hard drive, which arranges the folders alphabetically. It put "brother's" first. I hope this helps. Thanks for asking.

    asked by Stacey on November 13, 2006
  51. Algebra 2

    I need to find x of the quadratic function y=-5/3x^2-x-4. I'm supposed to use the formula x=-b/2a. The negative sign only applies to b. A=-5/3 and B=-1. When I substitute these values in I get -(-1)/2(-5/3). After working this out I get 1 over -10 over

    asked by Krystal on September 2, 2013
  52. Math

    Jenny and Dan want to save for an RV.They estimate that they will need $15,000 in 8 years. They can get 3% interest compounded semiannually. How much would they need to deposit now in order to have $15,000 in 8 years ? Put answer to the nearest cent.

    asked by Mary Williams on June 23, 2017
  53. science

    During the shot put competition at a track and field meet, a shot putter transfers 245J of energy to a 7200g steel ball he is throwing. What is the velocity of the ball?

    asked by mona on May 9, 2012
  54. accounting

    You notice that your accounts receivable days have doubled in the first six months of this year. Do you give the A/R Director a bonus or put him/her on probation? Why? Explain fully what questions you would ask the Director about the A/R and why it has

    asked by christine on February 22, 2012
  55. Calculus

    So here is the question: Find and equation of the tangent line to the graph: 4)f(x)=e^(2x) passing through the point (0,0) I find derivative being f'(x) =2e^(2x) Then m = f'(0) = 2 put into point slope formula: (y-y1)=m(x-x1) y-0 = 2(x-0) which comes out

    asked by Tom on October 5, 2014
  56. Math

    A rectangular plot, 18 ft by 19 ft, is to be used for a garden. It is decided to put a pavement inside the entire border so that 110 square feet of the plot is left for flowers. How wide should the pavement be?

    asked by Chelly on September 7, 2015
  57. Chemistry

    I don't understand how you know what state designation things are in a chemical equation. For example this is given: 2 (NH4)3PO4 (__) + 3 Ba(NO3)2 ---> Ba3(PO4)2 (__) + 6 NH4NO3 (__) How do you just know what to put for their state or phase designation?

    asked by Kristin on March 10, 2011
  58. Maths

    Captain salman has 12m of fencing that he wants to use to make rectangular pens to put around his garden to make predators out. He wants to enclose the biggest possible region. What is the area he can enclosed by using the given pens

    asked by Kusumq on December 14, 2017
  59. English- Medieval Period

    This refers to Sir Gawain and the Green Knight Gawain's actions at the castle reveal that the knight's moral code values: a. strength b. courage c. loyalty d. NONE OF THE ABOVE I put B, I am not sure though.... ???

    asked by sophie on April 23, 2009
  60. English

    Ok I have got a silly question but I don't know how to do a work cited page. I know how to create one but my question is in my paper to I need to label my source/resource as a number or do I put the whole web address in the source?

    asked by Brann on November 12, 2011
  61. probability

    The letters of the word mathematics are written on separate pieces of paper and put in a hat. What is the probability of drawing the letter m from the hat? my first answer is 2/12= 1/6 someone else has 2/11 please show us the correct answer thanks!

    asked by bria on July 5, 2012
  62. math

    forty-nine days is how many weeks? what are the factors of 12? forty books were put into eight equal stacks how many books were in each stck? how many years are in five centuries? what is the seventh mutiple of 6 then subtract 12 what is the differcecne?

    asked by jojo on December 15, 2010
  63. Science-PsyDAG

    We did a experiment to recognize chemical change and here it is: I'm listing what we did, step by step. 1. Put on your safety goggles. In one row of your spot plate, add five drops of the sodium hydroxide solution to each of four deprssions. Then add two

    asked by Sara on March 24, 2010
  64. creative play

    While helping fourth-grade students with reading comprehension difficulties, a teacher tries to think of an approach that would support them in this important learning. What is one effective instructional strategy to use? A. Let the students complete

    asked by bev on June 27, 2017
  65. Algebra

    Explain why you think a sign on a copy machine reading ".05 (cent sign) a copy" is put up by mistake?

    asked by KG on October 21, 2014
  66. discrete math

    There are n identical balls and m different bins. Let Bn,m be the total number of way to put n balls in m bins. (a) What are B1,1, B2,1, B1,2, B2,2, B3,2? (b) Express Bn,m in terms of Bk;m-1, for k = 0,….. n.

    asked by akash on April 30, 2017
  67. APA Citations

    How do I do an embedded APA Citation for a picture? I need to put the citation underneath a picture within my report. Thanks Lucy

    asked by Lucy on April 25, 2008
  68. algebra

    find the domain and the range f(a)=t f(b)=s f(c)=q f(d)=t f() domain a,b,c,d range t,s,q,t Ican not remember if I am suppose to put the second t i the f(x) or a o and remove the second t?

    asked by BERNIE on June 13, 2012
  69. percentage

    If I put $5,000 in a CD for a miniumum of 3 years, the bank will offer 3.25% interest. How much interest will I earn after 6 years?

    asked by Valerie on August 31, 2008
  70. discrete math

    Q 3: There are n identical balls and m different bins. Let Bn,m be the total number of way to put n balls in m bins. (a) What are B1,1, B2,1, B1,2, B2,2, B3,2? (b) Express Bn,m in terms of Bk;m-1, for k = 0,….. n.

    asked by akash on May 2, 2017
  71. discrete math

    Q 3: There are n identical balls and m different bins. Let Bn,m be the total number of way to put n balls in m bins. (a) What are B1,1, B2,1, B1,2, B2,2, B3,2? (b) Express Bn,m in terms of Bk;m-1, for k = 0,….. n.

    asked by akash on May 1, 2017
  72. Health

    How many American adults does OCD affect each year? A. 1.2 million B. 2.2 million C. 3.2 million D. 4.2 million I put D and missed it. D:

    asked by Justin on August 30, 2012
  73. discrete math

    Q: There are n identical balls and m different bins. Let Bn,m be the total number of way to put n balls in m bins. (a) What are B1,1, B2,1, B1,2, B2,2, B3,2? (b) Express Bn,m in terms of Bk;m-1, for k = 0,….. n.

    asked by akash on May 1, 2017
  74. geometry

    im trying to explain to my brother how to do graph this problem put im not sure how to solve it either. (x-3)^2+(y+5)^2=9 so if someone can explain how to graph this it would be greatly appreciated

    asked by Adam on September 3, 2008
  75. history

    what is the squre root of 89.367891212123211234321 Put this in the Google Search window: square root of 89.367891212123211234321

    asked by George W. Adams on December 1, 2006
  76. algebra

    If mark put 1/3 of his pay aside for July and spends the rest which was $90.00, what was the total amount of his pay for July?

    asked by me on February 19, 2016
  77. Algebra

    Divide: (y^2-y+4) divide by (y+3) I worked it out, but don't know how to put my answer can you please do it too and show me what the answer is. I used long division.

    asked by Kaashif on April 13, 2016
  78. Maths

    It takes for three gardeners 90 minutes to weed a garden. If the job is to be done in only 15 minutes, how many more gardeners need to be put on the jobs?

    asked by Sadaf on December 15, 2016
  79. Calc

    This is a piecewise function on one graph: f(x)= 3, -4

    asked by Kevin on August 18, 2008
  80. math

    a florist has 20 daisies and 36 carnations. She wants to put the same number of each type of flower into vases. what are the possible number of vases she can use?

    asked by stephy 3 on December 21, 2012
  81. Finance

    Sam wants to buy a car for $35000. How much does she need to put into an account earning 7% to buy the car in 5 years?

    asked by Anonymous on April 12, 2012
  82. Trigonometry

    Which Triangle has 2 solutions? a. A=130 degrees, a=19, b=11 b. A=45 degrees, a= 4(sqrt 2) b=8 c. A=32 degrees, a=16, b= 21 d. A=90 degrees, a=25, b=15 I really don't know how to do this one so I can't put what my answer is.

    asked by Chels on November 26, 2007
  83. English

    1. I'll get you Mr. Smith. 2. I'll put you through to Mr. Smith. 3. I'll connect you to Mr. smith. 4. I'll transfer your call to Mr. Smith. (Are they grammatical and similar in meaning?)

    asked by rfvv on September 2, 2017
  84. math

    Evaluate: -3/4 - 1 3/8 A: - 17/8 B: -1 C: 17/8 D: -5/8 I put C but its was incorrect. I'm to sure what the correct answer would then be. can you show me how to solve it and how to achieve the correct answer?

    asked by April on October 7, 2014
  85. math

    patty bought 24 yards of fencing to put around her garden. she only used 20 yards. how many feet of fencing did she have left over?

    asked by mi on September 3, 2010
  86. Science

    Beach sand contains plenty of the mineral quartz. Why should you not put your plastic sunglasses down on the sand at the beach?

    asked by Anonymous on January 27, 2016
  87. discrete math

    Q 3: There are n identical balls and m different bins. Let Bn,m be the total number of way to put n balls in m bins. (a) What are B1,1, B2,1, B1,2, B2,2, B3,2? (b) Express Bn,m in terms of Bk;m-1, for k = 0,….. n.

    asked by akash on May 2, 2017
  88. math

    if i wanted to be sure to take out a blue block,i would put in blank red blocks. if the bag has 3 blue blocks thank you for your help

    asked by happy face on May 6, 2009
  89. science

    how is schopf's theory similar to oparin's theory about the orgin of life? MODERN STROMATOLITES are structures built by cyanobacteria(blue-green algae), grace Shark Bay, Australia. Elsewhere in Australia, J. William Schopf of the University of California

    asked by La Tashia on January 16, 2007
  90. English-tenses

    Hello I have key answers for the following tasks but I would like a native speaker to explain to me the uses of tenses here.The students have to put past tenses here. I am especially confused with the sentence beginning with The vases, which.... isn't it a

    asked by Mark on November 25, 2011
  91. math algebra, please check my answers

    1) The slope of a line is 3/4, the line passes through the point(4,7). Where does the line intersect the y-axis? 2) If x/y=z, and x*y*a=0, which of the following variables have to=0? Assume each of the variables is = to a different number. 3) simplify this

    asked by Quarie on March 1, 2017
  92. Chemistry

    A closed bottle contains a solution of 5.0% by mass acetone [(CH3)2CO] in water. Calculate the vapour pressure (in kPa) of this solution at 25oC. The vapour pressure of pure water at 25oC is 3.17 kPa and that of pure acetone is 30.7 kPa.

    asked by Vanessa on February 5, 2017
  93. chemistry

    5.34g of salt of formula M2SO4 (M is a metal)were dissolved in water. The sulfate ion was precipitated by adding excess barium chloride solution when 4.66g of barium sulfate (BaSO4) were obtained. a)How many moles of sulfate ion were precipitated as barium

    asked by Ben on October 19, 2013
  94. BIOLOGY

    As cells get older, DNA gets damaged and lowers in DNA repair process what is the initial effect? Since this is not my area of expertise, I searched Google under the key words "DNA aging" to get these possible sources: http://www.chem-tox.com/DNA/aging.htm

    asked by Casio on March 26, 2007
  95. chemistry

    I would love some input on a few problems, listed below. My answers follow the questions 1. Would it be feasable to store a solution of lead nitrate in a container of metallic zinc? Why or why not? No, it would not. A chemical reaction takes place, as the

    asked by delany on July 2, 2008
  96. chemistry

    I would love some input on a few problems, listed below. My answers follow the questions 1. Would it be feasable to store a solution of lead nitrate in a container of metallic zinc? Why or why not? No, it would not. A chemical reaction takes place, as the

    asked by delany on July 3, 2008
  97. chemistry - titration

    Show that for the titration of a weak acid, HA, with NaOH solution, at half-titer, pH = pKa. Please explain your answer. Thank you. HA + NaOH ==> NaA + HOH Ka for HA = (H^+)(A^-)/(HA) and solve for H^+. (H^+) = Ka*[(HA)/(A^-) When HA is half neutralized,

    asked by phil on August 5, 2007
  98. Chem

    A solution is made by dissolving 0.584 mol of nonelectrolyte solute in 883 g of benzene. Calculate the freezing point and boiling point of the solution. Tf=? Tb=? I got Tf as 3.39 degrees Celsius I got Tb as 1.67 degrees Celsius It marked me wrong and said

    asked by Jen on February 18, 2012
  99. Chemistry

    I'm going crazy please help me out part 1 of 2 Determine the mass of anhydrous copper(II) sulfate that must be used to prepare 250 mL of 2.01 M CuSO4(aq). Which i found to be 80.204g part 2 of 2 Determine the mass of CuSO4.5H2O that must be used to prepare

    asked by ninzyy on September 5, 2011
  100. World History

    (MC)Why was Otto von Bismarck nicknamed the "Blood and Iron Chancellor"? He suffered from an iron deficiency disease. He received a disabling wound in battle. He put political enemies into prison. He preferred to use armed force.*********

    asked by Jessie on February 25, 2016